Expansion valve



Aug. 31 1926. 1,597,863

C. L. OLIN EXPANSION VALVE Filed August 7. 1923 lNVENTOR C/ML L. Oil/Y Patented Aug. 31, 1926.

UNITED I STAT/ES PATENT OFFICE.

CARL 'L. OLIN, F OAKLAND, CALIFORNIA.

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Application filed Aug'nst 1-1928. swarm. 656,280.

The object of my invention is to provide a novel, automatic controlling means for the needle valve, which will close said valve when the pressure is equalized on both sides 1 of the expansion valve. To accomplish the above results I provide an expansion valve with a body portion having a high pressure inlet portat one side and outlet port at the opposite side, a vertical bore in the bottom of the valve body contains a sliding block with a pin which is adapted to open and close a passage from the inlet port. A duct leads from this bore to the outlet port and a 'pair of ducts from the outlet port to the 208 under side of the diaphragm and to the under side of a plate resting against the bottom of the diaphragm. The diaphragm itself is mounted between the main body and'a cap,

. and may be tensioned by means of a spring. A pair of pins fixed to the blockloosely edge the plate which bears against the diaphragm and hence control the opening and closing of the inlet passage and thence of the vaive. Other novel objects and advantages will be more specifically described in the following detailed description.

' In the annexed drawing in whichmy in vention is illustrated-- .Figure 1 is a transverse sectional view of zmy expansion valve.

- Figure 2 is a sectional view taken on the line. 2-2 of Figure 1. i

Rei'erring more particularly to the drawing, my expansion valve consists of a body .1 in which ,is formed. a high pressure, inlet port 2 and an outlet port 3. A vertical bore 4 is formed in the bottom of the body 1 and extends upwardly adjaceiit the ports 2 and 3. This bore is adapted to receive] a block 5 which reciprocates therein and carries a needle 6 which is adapted to enter a passage between the port'21and bore 4, thus forming a needle valve 7, as will be further described. A port 8 extends from the bore 4 to the port 3, through which the liquid expands into the goohng co1ls. I

A diaphragm 9 is positioned in the upper part of the body 1 and'is held in position by a ,cap 10 which threads into the body against the diaphragm. A spring 11 is positioned in the cap 10 and bears against the diaphragm 9 to urge it downwardly. The spring .11 is adjusted by a screw 12, which bears upon a plate 13 against the bottom of which plate the spring is positioned. 60

A cup 14 is threaded to the bottom of the body 1. and a "spring 15 is positioned in the cup and bears against the block 5 to urge it upwardly. i

A plate 1'6 rests against the bottom of the diaphragm 9 and 'is held in position by a pin 17 which depends from the bottom thereof and reciprocates in a bore 18 in the body '1. Pins 19 and 20 are secured in the block 5 and extend upwardly through the body 1 and rest against the bottom of the plate 16. Ducts 21 and 22 extend from the port 3 to the bore 18 and under the diaphragm 9 respectively, thus equalizing the pressure on both sides of the plate 16.

The operation of my invention is as follows With the refrigerating machinery running, and a low pressure on the port 3 the diaphragm 9 will be depressed which will lower the plate 1% and consequently move the block 5 and needle 6 downwardly through the medium of thepins 19 and 20, thus opening the valve 7 and permitting the escape of the fluid coming into the port 2. When the machine shuts down and the presphragm 9 rises and the block 5 and needle 6 are raised by the spring 1 5 to close the valve i Having described my'inven'tion, ll claim: An expansion valve comprising a body portion having an inlet port and an. outlet ort, a central bore extending downwardly elow saidports, a block slidably mounted in said bore, and a needle carried thereby, a passage leading from the inlet port to said bore and adaptedto be closed by said needle, a cap secured to the upper portion of said valve body, a diaphragm clamped between the cap and the valve body, a coiled s ring 10% within said cap adapted to urge sai dia- Phmgm rd y. a small bore said valve body, a loose plate having a pin formed integral therewith, said Din being slidable in the said small bore, a duct leading from the large bore to the outlet port, ducts leading from the outlet port to the small bore and to the top of the valve body,

and pins connected to said block and slidable in the valve body and adapted to contact with said loose plate, a second spring to resiliently elevate said block and thereby hold the loose plate in contact with the diaphragm, and a cup having a screw threaded engagement to the lower end of the valve body and adapted to form a seat for said second spring.

In testimony whereof I affix my signature.

CARL L. OLIN. 

